WI-2905-S EZ Mag Wheel Insert is a (silver) classic "Full Moon" style wheel cover that is precision molded for a secure, snug pressure fit. Designed to fit inside any 1/2" (.500") inner diameter wheel, EZ Mag Wheel Inserts are guaranteed to give your project an amazingly realistic appearance! Designed to work with 1/24 and 1/25 scale slot cars and scale models.